diff options
| -rw-r--r-- | drivers/net/ethernet/meta/fbnic/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/meta/fbnic/fbnic.h | 5 | ||||
| -rw-r--r-- | drivers/net/ethernet/meta/fbnic/fbnic_mac.h | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/meta/fbnic/fbnic_mdio.c | 195 | ||||
| -rw-r--r-- | drivers/net/ethernet/meta/fbnic/fbnic_pci.c | 3 |
5 files changed, 205 insertions, 0 deletions
diff --git a/drivers/net/ethernet/meta/fbnic/Makefile b/drivers/net/ethernet/meta/fbnic/Makefile index 15e8ff649615..72c41af65364 100644 --- a/drivers/net/ethernet/meta/fbnic/Makefile +++ b/drivers/net/ethernet/meta/fbnic/Makefile @@ -21,6 +21,7 @@ fbnic-y := fbnic_csr.o \ fbnic_pci.o \ fbnic_phylink.o \ fbnic_rpc.o \ + fbnic_mdio.o \ fbnic_time.o \ fbnic_tlv.o \ fbnic_txrx.o \ diff --git a/drivers/net/ethernet/meta/fbnic/fbnic.h b/drivers/net/ethernet/meta/fbnic/fbnic.h index fac1283d0ade..779a083b9215 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic.h +++ b/drivers/net/ethernet/meta/fbnic/fbnic.h @@ -95,6 +95,9 @@ struct fbnic_dev { u64 prev_firmware_time; struct fbnic_fw_log fw_log; + + /* MDIO bus for PHYs */ + struct mii_bus *mdio_bus; }; /* Reserve entry 0 in the MSI-X "others" array until we have filled all @@ -204,6 +207,8 @@ void fbnic_dbg_exit(void); void fbnic_rpc_reset_valid_entries(struct fbnic_dev *fbd); +int fbnic_mdiobus_create(struct fbnic_dev *fbd); + void fbnic_csr_get_regs(struct fbnic_dev *fbd, u32 *data, u32 *regs_version); int fbnic_csr_regs_len(struct fbnic_dev *fbd); diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_mac.h b/drivers/net/ethernet/meta/fbnic/fbnic_mac.h index 9b4fb0586dff..f08fe8b7c497 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_mac.h +++ b/drivers/net/ethernet/meta/fbnic/fbnic_mac.h @@ -56,6 +56,7 @@ enum { FBNIC_AUI_50GAUI1 = 2, /* 53.125GBd 53.125 * 1 */ FBNIC_AUI_100GAUI2 = 3, /* 106.25GBd 53.125 * 2 */ FBNIC_AUI_UNKNOWN = 4, + __FBNIC_AUI_MAX__ }; #define FBNIC_AUI_MODE_R2 (FBNIC_AUI_LAUI2) diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c new file mode 100644 index 000000000000..709041f7fc43 --- /dev/null +++ b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) Meta Platforms, Inc. and affiliates. */ + +#include <linux/mdio.h> +#include <linux/pcs/pcs-xpcs.h> + +#include "fbnic.h" +#include "fbnic_netdev.h" + +#define DW_VENDOR BIT(15) +#define FBNIC_PCS_VENDOR BIT(9) +#define FBNIC_PCS_ZERO_MASK (DW_VENDOR - FBNIC_PCS_VENDOR) + +static int +fbnic_mdio_read_pmd(struct fbnic_dev *fbd, int addr, int regnum) +{ + u8 aui = FBNIC_AUI_UNKNOWN; + struct fbnic_net *fbn; + int ret = 0; + + /* We don't need a second PMD, just one can handle both lanes */ + if (addr) + return 0; + + if (fbd->netdev) { + fbn = netdev_priv(fbd->netdev); + if (fbn->aui < FBNIC_AUI_UNKNOWN) + aui = fbn->aui; + } + + switch (regnum) { + case MDIO_DEVID1: + ret = MP_FBNIC_XPCS_PMA_100G_ID >> 16; + break; + case MDIO_DEVID2: + ret = MP_FBNIC_XPCS_PMA_100G_ID & 0xffff; + break; + case MDIO_DEVS1: + ret = MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS; + break; + case MDIO_STAT2: + ret = MDIO_STAT2_DEVPRST_VAL; + break; + case MDIO_PMA_RXDET: + /* If training isn't complete default to 0 */ + if (fbd->pmd_state != FBNIC_PMD_SEND_DATA) + break; + /* Report either 1 or 2 lanes detected depending on config */ + ret = (MDIO_PMD_RXDET_GLOBAL | MDIO_PMD_RXDET_0) | + ((aui & FBNIC_AUI_MODE_R2) * + (MDIO_PMD_RXDET_1 / FBNIC_AUI_MODE_R2)); + break; + default: + break; + } + + dev_dbg(fbd->dev, + "SWMII PMD Rd: Addr: %d RegNum: %d Value: 0x%04x\n", + addr, regnum, ret); + + return ret; +} + +static int +fbnic_mdio_read_pcs(struct fbnic_dev *fbd, int addr, int regnum) +{ + int ret, offset = 0; + + /* We will need access to both PCS instances to get config info */ + if (addr >= 2) + return 0; + + /* Report 0 for reserved registers */ + if (regnum & FBNIC_PCS_ZERO_MASK) + return 0; + + /* Intercept and return correct ID for PCS */ + if (regnum == MDIO_DEVID1) + return DW_XPCS_ID >> 16; + if (regnum == MDIO_DEVID2) + return DW_XPCS_ID & 0xffff; + if (regnum == MDIO_DEVS1) + return MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS; + + /* Swap vendor page bit for FBNIC PCS vendor page bit */ + if (regnum & DW_VENDOR) + offset ^= DW_VENDOR | FBNIC_PCS_VENDOR; + + ret = fbnic_rd32(fbd, FBNIC_PCS_PAGE(addr) + (regnum ^ offset)); + + dev_dbg(fbd->dev, + "SWMII PCS Rd: Addr: %d RegNum: %d Value: 0x%04x\n", + addr, regnum, ret); + + return ret; +} + +static int +fbnic_mdio_read_c45(struct mii_bus *bus, int addr, int devnum, int regnum) +{ + struct fbnic_dev *fbd = bus->priv; + + if (devnum == MDIO_MMD_PMAPMD) + return fbnic_mdio_read_pmd(fbd, addr, regnum); + + if (devnum == MDIO_MMD_PCS) + return fbnic_mdio_read_pcs(fbd, addr, regnum); + + return 0; +} + +static void +fbnic_mdio_write_pmd(struct fbnic_dev *fbd, int addr, int regnum, u16 val) +{ + dev_dbg(fbd->dev, + "SWMII PMD Wr: Addr: %d RegNum: %d Value: 0x%04x\n", + addr, regnum, val); +} + +static void +fbnic_mdio_write_pcs(struct fbnic_dev *fbd, int addr, int regnum, u16 val) +{ + dev_dbg(fbd->dev, + "SWMII PCS Wr: Addr: %d RegNum: %d Value: 0x%04x\n", + addr, regnum, val); + + /* Allow access to both halves of PCS for 50R2 config */ + if (addr > 2) + return; + + /* Skip write for reserved registers */ + if (regnum & FBNIC_PCS_ZERO_MASK) + return; + + /* Swap vendor page bit for FBNIC PCS vendor page bit */ + if (regnum & DW_VENDOR) + regnum ^= DW_VENDOR | FBNIC_PCS_VENDOR; + + fbnic_wr32(fbd, FBNIC_PCS_PAGE(addr) + regnum, val); +} + +static int +fbnic_mdio_write_c45(struct mii_bus *bus, int addr, int devnum, + int regnum, u16 val) +{ + struct fbnic_dev *fbd = bus->priv; + + if (devnum == MDIO_MMD_PMAPMD) + fbnic_mdio_write_pmd(fbd, addr, regnum, val); + + if (devnum == MDIO_MMD_PCS) + fbnic_mdio_write_pcs(fbd, addr, regnum, val); + + return 0; +} + +/** + * fbnic_mdiobus_create - Create an MDIO bus to allow interfacing w/ PHYs + * @fbd: Pointer to FBNIC device structure to populate bus on + * + * Initialize an MDIO bus and place a pointer to it on the fbd struct. This bus + * will be used to interface with the PMA/PMD and PCS. + * + * Return: 0 on success, negative on failure + **/ +int fbnic_mdiobus_create(struct fbnic_dev *fbd) +{ + struct mii_bus *bus; + int err; + + bus = devm_mdiobus_alloc(fbd->dev); + if (!bus) + return -ENOMEM; + + bus->name = "fbnic_mii_bus"; + bus->read_c45 = &fbnic_mdio_read_c45; + bus->write_c45 = &fbnic_mdio_write_c45; + + /* Disable PHY auto probing. We will add PCS manually */ + bus->phy_mask = ~0; + + bus->parent = fbd->dev; + bus->priv = fbd; + snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(fbd->dev)); + + err = devm_mdiobus_register(fbd->dev, bus); + if (err) { + dev_err(fbd->dev, "Failed to create MDIO bus: %d\n", err); + return err; + } + + fbd->mdio_bus = bus; + + return 0; +} diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c index dea5367d2190..861d98099c44 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c @@ -339,6 +339,9 @@ static int fbnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) goto init_failure_mode; } + if (fbnic_mdiobus_create(fbd)) + goto init_failure_mode; + netdev = fbnic_netdev_alloc(fbd); if (!netdev) { dev_err(&pdev->dev, "Netdev allocation failed\n"); |